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Fermat's little theorem facts for kids

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Fermat's little theorem is a theorem from number theory. It is named after Pierre de Fermat who found it in the 17th century. It is about the properties of primes. It says that if a is a number, and p is a prime, then

a^p \equiv a\,(\mathrm{mod}\,p),

If a is not a multiple of p, then the following is often used:

a^{p-1} \equiv 1\,(\mathrm{mod}\,p)

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